Welcome to our store! The SG90 9G micro servo weighs only 9g and has a torsion of 1.5-1.7 kg/cm (4.8V-6V). The 40A ESC features a safety arming function, throttle calibration function, and supports multiple programming methods. Compatible with lithium batteries (not included). Timing can be changed to suit different brushless motors. Comprehensive protection, including low voltage protection/overheat protection/throttle signal loss protection. This kit includes a 2217 KV1250 motor + 8060 propeller + steering motor + 40A XT60 ESC, which can provide your RC helicopter with better performance. Item Type: 2217 Motor Kit Material: Metal + Plastic SG90 9g Servo Parameters: Size: Approx. 21.5 x 11.8 x 22.7 mm/0.85 x 0.46 x 0.89 inches Weight: Approx. 9 g/0.32 oz No-load Speed: 0.12 s/ 60 degrees (4.8 V) Stall Torque: 1.5-1.7 kg/cm (4.8V-6V) Operating Temperature: -30-+ 60 ℃ Dead Zone Setting: 5 microseconds Operating Voltage: 4.8V-6V 2217 Motor Specifications: Size: Approx. 27.8 x 32 mm/1.1 x 1.3 inches Shaft Diameter: Approx. 4 mm/0.16 inches Kv: 1250kv 40A ESC Specifications: Plug: XT60 Continuous Current: 40A Peak Current: 55A (10S) Power Input: 2-4 lithium batteries (not included) BEC Output: 5V at 3A (Linear Regulator Mode-Linear Mode) Maximum Speed: 210,000 rpm for 2-pole motor, 70,000 rpm for 6-pole motor, 35,000 rpm for 12-pole motor Application: Suitable for RC remote control helicopters Includes: 1 x Motor 2 x Propeller 2 x Steering Motor 1 x ESC (battery not included) 1 x Motor Base 1 x Coniform Head 6 x Servo Arm 1 x Tie 10 x Screw 2 x rows of propeller washer Customers are our top priority. If you find any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.